Hey there!
I'm checking your site, but since I'm just a regular user and not in India, I can't really try the form and the whole process.
Could you tell me more about what is the language used? Is it pure PHP with mysql? Wordpress or other CMS?
Also what is the payment processor? Any api library you use or pure interaction with it?
If you could even send me -part of the source code involving the buying operation (as well let's say payment processor callback and stuff like this) it would be great and much easier for me :)
Let's talk in private, I'm serious, I know what I do , coming from a grey hat past